Electromagnetic device



July 13, 1926. 1,592,782

H. SENGEBUSCH ET A],

-ELEGTROMAGNETIC DEVICE Filed April 25, 1924 Patented July 13, 1926.

UNITED STATES 1,592,782 PATENT OFFICE.

HANS BENG-EBUSCH AND JOHN ERICKSON, OF CHICAGO, ILLINOIS, ASSIGNORS, BY MESNE ASSIGNMENTS, TO AUTOMATIC ELECTRIC INC., OF CHICAGO, ILLINOIS, A

CORPORATION OF DELAWARE.

ELECTROMAGNETIC DEVICE.

Application lied April 25, 1924. Serial No. 708,870.

The present invention relates in general to electromagnetic devices,but is particularly concerned'with devices of the type in whichit is necessary to adjustably position.

the electromagnets on their supporting frame; and the particular object of the invention in the present instance is to provide an improved method of adjustabl'y su porting the electromagnets of such a evice, which is decidedly preferable to any method heretofore known.

The well known Strowger switch is a good example of an electromagnetic device which is provided with the so called vertical and rotary magnets which are adjustably secured to the supporting frame to enable the distance between the magnets and their armature to be adjusted.

In order to describe the invention the same has been illustrated in a drawing comprismg Figs. 1 and 2. ig. 1 is an enlar ed plan' view of the parts used to adjusta 1y secure an electromagnet to its supporting frame in accordance with the invention.

Fig. 2 shows an enlarged view of the invention as applied to a pair of vertical or rotary magnets of an ordinary Strowger switch. In this figure certain of the parts are shown in cross section in order to make clear the relation between various parts.

In Fig. 1 of the drawings thev adjusting screw 1 and the holding screw 3 are the same as those used heretofore for 'adjustably securing the magnets to the switch frame, while the socket wrench member. 2 comprises the means which, when used in conjunction with members 1 and 3, constitutes the means for adjustably securing a ma switch frame 1n accordance with the present invention.

In Fig. 2, by disregarding the member 2, we have illustrated the old method by which the above results are accomplished. When securing a ma et to the frame, according to the old met od, the adjusting screw 1 1sscrewed into place in the frame 4, and the holding screw 3 is drop down through the opening in adjusting screw 1 and through a hole in the usual. yoke member 5. The screw 3 is 'then screwed into a threaded opening'i-n the core 6 of the magnet 7 until the core 6 and member 5 are drawn up against adjusting screw 1. Ifit proves nee et to the essary to shift the magnet either away from or nearer to its armature the screw 3 is slightly loosened and the adjusting screw 1 turned to the right or left, depending, of course, upon which adjustment is desired, and the screw 3 is then again tightened tion of loosening screw 3 and turning adjusting screw 1 to the right or left and then again tightening screw 3 being repeated until proper adjustment is made.

The above method of adjustably securing the magnet to the frame is very satisfactory so long as a tight fit is obtained between the threads of the adjusting screw and the threads of the frame. In quantity production, however, it is diflicult to maintain. a uniformly tight fit between these parts, due to the wear on, and frequent breakage of, the jigs, taps, and dies used in their manu-' facture. As a result, unless a close inspection is continuously carried on, certain of the adjusting screws will fit loosely in the frames and in this case, no matter how tightly adjusting screw 1, yoke 5, and core 6 are held together by holding screw 3, play will still exist between the core 6 of magnet 7 and frame 4. When this condition exists proper operation of the magnet is impossible, and the only thing to do is to replace the adjusting, screw with a-slightly larger one.

On the other hand, in certain instances the adjusting screwsl prove to be such a tight fit in the frame that it is almost impossible to turn, them and they are quite often broken. In these instances much time down against adjusting screw 1, the operais wasted in removing the adjusting screws and replacing them with new ones.

. In the present case all these various troubles are overcome by adding the socket member 2. The various parts are secured to the frame in the same manner as formerly,

but with the addition of member 2 placed over adjusting screw 1. Adjusting of the magnet is accomplished the same as hereto-' however, the tension exerte in addition, since the head of screw 3 isnow supported by socket member 2, which in turn is supported by the supporting frame any play existing between the threads of ad usting screw 1 and the threads of the frame 4 is taken up. Therefore, no closefit between the threads of adjusting screw 1 and the frame 4 is necessary.

Since no close fit is necessary between these members the adjusting of the magnet is made relatively easy and at the same time any danger of having loose magnets due to.

a a magnet associated therewith, a tubular adjusting screw loosely fixed to said frame for adjusting the distance between said magnet and said frame. and means jointly effective for holding said adjusting screw in tight fixed relation to said frame and for holding said magnet in .fixed relation to said adjusting screw. 7

2. In combination, a magnet core, a frame having a threaded opening therein, a tubular adjusting screw extending through said opening on both sides of the frame for spacing said core therefrom, a perforated auxiliary adjusting member enclosing the head of said adjusting screw and resting against the said frame, a threaded opening in one end of said magnet core in line with the opening in said tubular adjusting screw, and a clamping screw extending through the said auxiliary member and adjusting screw and entering the threaded opening in said core to secure the parts together.

3. In an electro-magnetic device, a frame a magnet, an adjustable mounting means comprising a tubular adjusting screw threaded into the frame on which the device is mounted, a perforated collar fitted over the head of said adjusting screw and resting against said frame, a threaded opening in the device to be mounted, a machine screw extending through said collar and adjusting screw into said opening, said collar and adjusting screw cooperating to position said device with respect to said frame and said collar, machine screw and device cooperating to lock said adjusting screw in place.

4. In an electro-magnetic device, a magnet, a frame for supporting said magnet, a polygonally headed adjusting screw for varying the distance between the core of said magnet and said frame, a polygonally shaed member encompassing the head of sai screw permitting endwise movement of 'the screw therein and restingagainst the frame, and a retaining screw passing through the member and collar into the core of the magnet, said screw when tightened, clamping the magnet against the members at any distance from the frame and clamping the members into the frame.

5. In an electro-magnetic device, a magnet, a frame for supporting said magnet, and adjusting screw extending through the frame and movable thereto to space the magnet at various distances from the frame, a collar telescoped over the head of the adjusting screw and bearing against the frame on the opposite side from the magnet, each rotary movement of the collar causing an endwise movement of the adjusting screw, and a locking screw holding the magnet against the adjusting screw and holding the adjusting screw in fixed relation to the frame.

In witness whereof, I hereunto subscribe my name this 22d day of April, A. D.. 1924. HANS SENGEBUSCH.

In witness whereof, I hereunto subscribe my name this 22 day of April, A. D., 1924.

JOHN ERIGKSON. 

